The Blog
Hard-won lessons on email verification, inbox placement, and keeping your sender reputation spotless — from the team that's been verifying email since 2000.
Anti-spam laws and compliance: CAN-SPAM, GDPR, CASL
Measure and improve your welcome email double opt-in placement rates. Reduce bounces, avoid spam traps, and boost inbox delivery with accurate email.
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Learn how Yahoo's email reputation model works—domain or IP based? Discover real-world implications and how to maintain inbox placement with MailTester’s.
Decode SparkPost's Bird bounce classification codes with real-world clarity. Reduce bounces, improve deliverability, and clean your list with confidence.
Learn how AMP email fallback works, why HTML and text parts matter, and how to ensure inbox delivery with real-time verification.
Discover why Google Postmaster Tools shows no data for your domain and how to resolve insufficient volume issues with actionable steps.
Stop losing users to spam folders. Learn why password reset emails go to spam and how to fix deliverability with real-world verification tools and best.
Fix slow OTP email delays with real-time verification and inbox placement testing. Improve delivery speed and user experience today.
Compare Resend and Postmark DNS setup for SPF, DKIM, and return-path. Fix deliverability issues with accurate verification and inbox testing.
Prevent deliverability issues with this actionable JMRP complaint handling checklist for new email senders.
Compare IP pool strategies and pricing across ESPs in 2026. Reduce bounce rates, improve deliverability, and cut costs with verified list hygiene.
Learn how JMRP complaints impact Outlook sender reputation and what to do about it. Use MailTester’s real-time verification to avoid bounces and protect.
Understand SparkPost Bird pricing tiers for 2026. Learn how to compare plans, avoid pitfalls, and use email verification to improve list hygiene and.
Stay sharp
Occasional, practical notes on verification and inbox placement. No spam — we'd be embarrassed.
